Should You Worry? Petrol in a Diesel Car in Charlemont
Unstarted? Then less anxious than you likely feel. Petrol sitting in a diesel tank does nothing to the motor till something draws it through the fuel system — the ignition priming the pump, your starter, or driving itself. So the honest answer to the first question anyone around Charlemont asks, "have I wrecked it?", is generally no. To leave the vehicle like that, call Petrol in Diesel then leave your motor switched off. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and ways to make sure you don't do it again.
What petrol in a diesel does to your engine
Diesel does two jobs on its way through a motor. Oiling comes before burning; it does both. What stops the surfaces inside the high-pressure pump and the injectors from grinding against each other is your diesel flowing through them — they are made to very fine tolerances.
Badly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the clattering.
The shape of the trouble is clear when you put those together. The damage is done by circulation, not by contact. A tank with petrol in it is a fuel problem. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to your injectors further on.
Charlemont, petrol in a diesel: four situations, from mild to serious
Fuelled up, not once started. The best case there is. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol kept inside the tank alone, it's emptied and cleaned right where it stands, and nothing more is needed.
Your ignition turned on, or a short start. Petrol has left the tank and got to the filter and the lines, because your system has been primed. Drain, flush, see to the filter: still usually easy.
A few miles driven, and the pump has spent each of them labouring on diluted fuel. Tank, lines, filter, then clean fuel run through the entire circuit: that's the work, and the way the car was driven matters as much as the distance. A school run to the local primary school is one matter. Very different a second time: a trip to Armagh, under 10 miles away, or any miles on the M77, over 50 miles from Charlemont, where the motor never stopped working hard.
Clattering, an uneven idle, smoke, a throttle gone soft: driven till it complained. That is the engine telling you its fuel has stopped acting like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Chalet Road. The fuel drain and flush still go first, and they take care of it: if a vehicle is stopped soon, permanent damage is very unusual.
Petrol in a diesel myths Charlemont drivers hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing comes out when you top up — your tank simply holds more of the same mixture. A diesel fuel system doesn't accept petrol by percentage in the way that advice assumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. Lubrication matters more on current diesels, not less, because their fuel runs through more precise components at higher pressure.
"It starts, it drives, so no harm done" — the myth that catches most people than any other. Feed diesel to a petrol engine and it generally won't run, and so the motorist stops — and the damage stops with them. While the pump wears, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Running doesn't mean fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, meant for another issue. What petrol has diluted stays diluted, and the petrol remains inside the tank regardless.
Myth: "Drain that tank yourself and you are sorted." Once the motor has been run, some of the petrol is no longer in that tank: it is in the fuel filter and the fuel lines, and it goes straight back through your pump on your next start. Besides, petrol cleared into a can by the road is truly dangerous.
Petrol in a diesel: how does it happen?
It is seldom carelessness, and nobody does it on purpose. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That's how the forecourt makes it straightforward.
Routine and the vehicle getting out of step is how it takes place. Hire cars, courtesy cars, and motors that are new to you. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Fuelling up in a hurry en route to the nearest station, with a train to catch. Exactly the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. With rain, a call coming in, or children to deal with, the hand simply does what it always has.
Next time you fill up around Charlemont: avoiding petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Read the petrol pump's label; the colour is just a clue.
- Many motors state the fuel type inside your filler flap or on the cap, and so check it on your first fill in any motor you don't know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key if a home has one of each. So mark it.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems daft and it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away then keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to refuse a petrol nozzle, and add-on devices exist for the remainder. Count it as a backstop, then keep reading the petrol pump.
- Stop the moment you realise. Less petrol in the tank means a thinner blend. It doesn't change what to do next, which is still not to fire it up.
Petrol already in a diesel in Charlemont? Start here
In that case, there is only a short order of things. Starting it is out, and so is turning on your ignition. Yet on the forecourt, at the nearest petrol station or anywhere else? Ask the staff to help you push it clear of the petrol pump. Then phone 0333 366 0103 and tell us what got in, about how much, and if it's run.
Say so if it was AdBlue rather than petrol: it is a separate problem, with its own page for Charlemont, since AdBlue brings corrosion and deposits rather than lost protection.
What makes one Charlemont petrol in a diesel job cost more than the next
Four different jobs sit behind the four situations above — which is why there is no fair single quote. What shifts the cost is chiefly which of them you are in. The ratio matters next, meaning how much of the tank is petrol, and then the position of the car and whether getting to it is safe for our van.
That is why we ask three queries before quoting instead of after: what went in, how much, and whether it's run. Given those replies, you get a straight figure rather than a range.
About Charlemont itself
Charlemont is a small locality in County Armagh, situated inland near the city of Armagh. Charlemont has a relatively low elevation of 32 metres and is located near several other small settlements, including Moy, Collegeland, and Blackwatertown. Charlemont is characterized by its predominantly semi-detached housing stock and is home to a population of around 611 people.
Charlemont and County Armagh: where our fuel drain cover runs
Moy, Collegeland and Blackwatertown are among the spots around Charlemont that the same vans work, answering petrol in diesel calls across Charlemont's BT postcode area. The car doesn't need to move to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump in Charlemont, still?
The best position there is, then — that is where you are. Keep it off. Call.